It turns out that the reason behind this restriction is because U Mobile do not have any agreement with Apple to support their devices, as revealed by a number of tweets to their customers on Twitter. For, there is still no official indication on whether that will change anytime soon. So, you might need to look somewhere else for the time being if you want LTE connectivity for your Apple devices.

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Originally deep in the eSports arena before making a move into the world of consumer tech, his current love are but not exclusive to PC hardware, gaming peripherals/system, fitness tech, virtual/augmented/mixed reality, and Microsoft products.
Has soft spot for Nokia devices.
No, Chapree is not his real name but he doesn't mind.